Animate, you need to REFERSH your browser page, not hit BACK. And I use it with Firefox, and it wolrs perfectly, as long as I do what I just said.
Maurice, you need to establish a direct telnet/SSH session with your server, CD to the directory the file is in, and execute the "LS -L" command like I specified above (be sure to use ALL LOWER CASE

) Once you see your file's permission list, you execute the CHMOD 755 FILENAME command (again, the CHMOD part must be in LOWER CASE). You need to be the owner of the file or superuser to be allowed to change the permissions.
Hope this helps.